Optical Polymer with Cyclic Structures for Birefringence Control
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Solution Overview
Problem
Current optical compensation films for flat panel displays, such as LCDs and OLEDs, face challenges in maintaining image quality due to external light reflection and birefringence, which affect contrast ratio and color shift, and existing polymers with positive birefringence are expensive and difficult to produce.
Innovation Solution
A polymer for optical films is developed with a repeating unit that exhibits positive and negative birefringence, allowing for the creation of films with reverse wavelength dispersion, which can be used alone or in combination with other polymers to improve image quality by aligning the main chain refractive index and optimizing cyclization ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cyclic olefin polymer or polycarbonate is used to achieve positive birefringence, then the refractive index in the direction parallel to the main chain is increased, but the polymerization becomes very difficult and the cost becomes very expensive
Solution Approach 1:
The patent changes the chemical structure parameters by introducing cyclic structures at specific positions in the polymer chain and selecting particular monomer compositions, thereby achieving positive birefringence through structural modification rather than difficult polymerization processes
Solution Approach 2:
The patent uses composite material approaches by combining specific monomer units with cyclic structures in defined ratios to achieve the desired optical properties, avoiding the need for complex single-polymer synthesis
2Manufacturing precision
If side chains are substituted to the main chain to increase refractive index in the elongation direction, then positive birefringence is attempted, but the effect is insignificant
Solution Approach 1:
The patent segments the polymer structure by introducing cyclic units at specific positions along the chain rather than using continuous side chains, creating discrete optical activity centers that collectively produce significant positive birefringence
Solution Approach 2:
The patent introduces cyclic (curved) structures into the polymer chain to create anisotropic electron distribution, which significantly enhances the refractive index in the direction parallel to the main chain compared to linear side chains
3Reliability
If optical compensation film is used to convert elliptical polarization to circular polarization, then image quality is improved, but the film requires expensive and difficult-to-produce polymers
Solution Approach 1:
The patent employs readily available monomers and straightforward polymerization methods to produce optical compensation films at lower cost, making the technology economically viable for widespread display applications
Solution Approach 2:
The patent optimizes polymer composition parameters and cyclic structure ratios to achieve the required optical performance using conventional, easily manufacturable materials rather than exotic or difficult-to-synthesize polymers
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymer achieves effective phase-difference values and improved light transmittance, haze, and heat resistance, enabling enhanced image quality and cost competitiveness compared to commercialized polymers like cyclic olefin polymer and polycarbonate.
Implementation Method 1
A polymer for optical films is developed with a repeating unit that exhibits positive and negative birefringence, allowing for the creation of films with reverse wavelength dispersion
Data Source
AI summary
Disclosed is a polymer comprising a repeating unit represented by Chemical Formula 1, or a polymer comprising a repeating unit represented by Chemical Formula 2:wherein R1, R2, x and y are as defined herein.